Alcea rosea 'Double Carnival Mix' is a classic biennial hollyhock featuring stunning double flowers in mixed colors including blush pink, rose red, white, scarlet, and yellow. These tall, ornamental plants can reach 4-8 feet in height and are prized for cottage gardens, borders, and attracting pollinators. The Double Carnival Mix seeds germinate easily with light exposure and warm temperatures, making them ideal for indoor seed starting 6-8 weeks before the last frost.
Before sowing
Warm water soaking is recommended but not required. This treatment softens seed coat and increases germination percentage.
Sowing
What to expect
Tips
Seeds require light to germinate, so sow on soil surface and press gently without covering completely. Maintain consistently moist (not soggy) soil at 60-70°F for best results. Soak seeds in warm water for 12 hours before sowing to improve germination rates. Start indoors 6-8 weeks before the last frost date for earlier blooms. These biennials typically flower in their second year, but may flower the first year if started early indoors. Protect young seedlings from slugs and snails. Provide well-drained, fertile soil with full sun exposure for transplanting outdoors.
Sources: Pinetree Garden Seeds, True Leaf Market, Outside Pride, Royal Horticultural Society, University of Illinois Extension, North Carolina State Extension
